检索结果-南通市图书馆

The research on the substitution effect between the wireless and fixed telecommunication industry

在线全文

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2006年第3期13卷 102-106页

作者： DOU Cai-lan long Xiao-yu Department of Economics and Management Xi'an Institute of Posts and Teleconununications Xi'an 710061 China

Wireless telecommunication has developed at a rapid pace than the fixed telecommunication since the last decades of twentieth century. This article analyzes the effect wireless mobile telecom substitutes for the fixed telecom by employing the normal theory of substitution and econometrics model. The analytical results are consistent with the reality, and it has been observed that the relation between the wireless and fixed telecommunication industry has changed from state of being complementary in the early last decades of twentieth century to that of being substituted at present. Moreover, the enhanced progress of telecommunication technology especially in wireless areas enriches customers＇ demands in terms of multimedia contents thereby changing their communication style, which significantly promotes the rapid growth of wireless mobile communication and strengthens the effect of the substitute.

关键词： effect of substitute wireless telecommunication,fixed telecommunication telecommunication industry

A virtual service placement approach based on improved quantum genetic algorithm

在线全文

学校读者我要写书评

暂无评论

Frontiers of Information Technology & Electronic Engineering 2016年第7期17卷 661-671页

作者： Gang XIONG Yu-xiang HU Le TIAN Ju-long lan Jun-fei LI Qiao ZHOU National Digital Switching System Engineering&Technological Research Center Zhengzhou 450002China Department of Mathematics and Computer Science University of AntwerpAntwerp 2020Belgium

Despite the critical role that middleboxes play in introducing new network functionality,management and innovation of them are still severe challenges for network operators,since traditional middleboxes based on hardware lack service flexibility and ***,though new networking technologies,such as network function virtualization(NFV) and softwaredefined networking(SDN),are considered as very promising drivers to design cost-efficient middlebox service architectures,how to guarantee transmission efficiency has drawn little attention under the condition of adding virtual service process for ***,we focus on the service deployment problem to reduce the transport delay in the network with a combination of NFV and ***,a framework is designed for service placement decision,and an integer linear programming model is proposed to resolve the service placement and minimize the network transport *** a heuristic solution is designed based on the improved quantum genetic *** results show that our proposed method can calculate automatically the optimal placement *** scheme can achieve lower overall transport delay for a network compared with other schemes and reduce 30% of the average traffic transport delay compared with the random placement scheme.

关键词： Software-defined networking(SDN) Network function virtualization Quantum genetic algorithm Middlebox

Shed a New Light on Spinal Cord Injury-induced Permanent Paralysis with the Brain-spine Interface

在线全文

学校读者我要写书评

暂无评论

Neuroscience Bulletin 2023年第12期39卷 1898-1900页

作者： Shuang Zou Yang Zheng Xuhong Jiang Yu-long lan Zhong Chen Cenglin Xu Xinhua Hospital of Zhejiang Province The Second Affiliated Hospital of Zhejiang Chinese Medical UniversityKey Laboratory of Neuropharmacology and Translational Medicine of Zhejiang ProvinceSchool of Pharmaceutical ScienceZhejiang Chinese Medical UniversityHangzhou310053China Department of Neurology Zhejiang Provincial Hospital of Chinese MedicineThe First Affiliated Hospital of Zhejiang Chinese Medical UniversityHangzhou310060China Department of Neurosurgery Second Affiliated HospitalSchool of MedicineZhejiang UniversityHangzhou310000China

How to deal with severe spinal cord injuries(SCI)?This question remains an everlasting challenge for *** innovative therapies such as neuromodulation,which targets the surviving tissue,have shown the potential to restore cognitive functions in patients with severe SCI after rehabilitation[1,2].These therapies might enable SCI patients to sustain active movements during rehabilitation training to enhance the reorganization of the neuronal pathways,however,the complete recovery of body movement functions was still not reached with these therapies.A characteristic feature of SCI is the impairment of neural information communication between the neurons in the spinal cord and the brain,which are responsible for regulating body ***-computer interfaces(BCIs)have been successfully applied in dealing with movement dysfunction by establishing a direct connection between brain cortical activity and electrical muscle stimulation,thereby restoring limb function in cases of paralysis[2].

关键词： injuries stimulation thereby

Acute mesenteric ischemia due to percutaneous coronary intervention:A case report

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2022年第28期10卷 10244-10251页

作者： Peng Ding Yuan Zhou Kun-lan long Song Zhang Pei-Yang Gao Department of Critical Care Medicine Hospital of Chengdu University of Traditional Chinese MedicineChengdu 610072Sichuan ProvinceChina Department of Geriatrics The General Hospital of Western Theater CommandChengdu 610083Sichuan ProvinceChina

BACKGROUND Percutaneous coronary intervention(PCI) is extensively used to treat acute coronary syndromes(ACS).Acute mesenteric ischemia is a life-threatening disease if *** SUMMARY An 81-year-old female presented with 3 d of lethargy and 1 d of *** November 16,2021,the patient developed a *** oxygen saturation dropped to 70%-80%,the patient was admitted to the intensive care unit for further *** computed tomography(CT) showed chronic bronchitis,emphysema,and multiple lung *** CT scan showed no obvious abnormalities,but have severely calcified abdominal *** patient received assisted ventilation,and vasoactive,and anti-infection *** level was *** the patient was in a coma,it could not be determined whether she had chest *** cardiologist assumed that the patient had developed ACS;therefore,the patient underwent PCI via the left femoral artery approach,and no obvious abnormalities were found in the left and right coronary *** the second postoperative day,the patient presented with abdominal distension and decreased bowel sounds;constipation was considered and a glycerin enema was *** day 4,the patient suddenly lost consciousness,and had decreased blood pressure,abdominal wall swelling with increased tension,and absence of bowel *** urgent abdominal CT scan revealed gas in her hepatic portal system with extensive bowel wall *** patient died on day 5 due to intractable *** The potential serious complications in patients undergoing PCI,especially the patients who are hemodynamically unstable and have severely calcified abdominal vessels,should all be considered.

关键词： Percutaneous coronary intervention Acute mesenteric ischemia Acute coronary syndrome Vascular calcification Case report

Visual Modeling of Rice Root Growth Based on B-Spline Curve

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Wuhan University Journal of Natural Sciences 2022年第1期27卷 85-92页

作者： YANG Le TANG Zizong WU Panpan PENG Jun SHI Junlin long lan School of Computer and Information Engineering Jiangxi Agricultural UniversityNanchang 330045JiangxiChina Key Laboratory of Agricultural Information Technology in Jiangxi Higher Education Institutions Nanchang 330045JiangxiChina

As a major food production crop in China,the growth and development of rice is an extremely complex systemic process,and the root system is the main organ for rice to obtain ***,3D modeling and visualization of the rice root system can help to further understand its morphology,structure and function,and provide an aid for scientific cultivation of rice and improving rice yield for decision *** this paper,a mathematical model of the rice root system is established based on the B spline curve combined with the L-system approach,using mathematical knowledge based on the 3D morphological characteristics of the real rice root *** B-Spline Curve is chosen to simulate this,and the recursive definition of B-Spline Curve and its formula are used to realize the modeling of the rice root system *** on the mathematical method of rice root system integration,the bending effect of rice root system at different periods and different growth positions is ***,the L-system combined with B-Spline Curve is used to construct a rice root system model and realize the rice root system visualization *** simulated image is closer to the real rice root system image in terms of morphological structure and has a strong sense of realism.

关键词： rice root system visual modeling L-system B-Spline Curve

Steroidal Saponins from the Genus Smilax and Their Biological Activities

在线全文

学校读者我要写书评

暂无评论

Natural Products and Bioprospecting 2017年第4期7卷 283-298页

作者： Li-Wen Tian Zhen Zhang Hai-lan long Ying-Jun Zhang School of Pharmaceutical Sciences Southern Medical UniversityGuangzhou 510515China State Key Laboratory of Phytochemistry and Plant Resources in West China Kunming Institute of BotanyChinese Academy of SciencesKunming 650201China

The Smilax species,widely distributed in tropical region of the world and the warm areas of East Asia and North America,are extensively used as folk medicine to treat inflammatory *** investigation on Smilax species showed they are rich sources of steroidal saponins with diversified structure types,including spirostane,isospirostane,furostane,pregnane,and *** review mainly summarizes the steroidal saponins(1–104)reported from the genus Smilax between 1967 and 2016,and their biological *** relationship between structures of steroidal saponins and related biological activities were briefly discussed.

关键词： Smilax Steroidal saponins Biological activities

Heavy ion induced upset errors in 90-nm 64 Mb NOR-type floating-gate Flash memory

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2018年第9期27卷 615-619页

作者： Jin-Shun Bi Kai Xi Bo Li Hai-Bin Wang lan-long Ji Jin Lil and Ming Liu Institute of Microelectronics Chinese Academy of Sciences Beijing 100029 China University of Chinese Academy of Sciences Beijing 100049 China School of Internet of Things Engineering Hohai University Changzhou 213022 China

Upset errors in 90-nm 64 Mb NOR-type floating-gate Flash memory induced by accelerated ^（129）Xe and ^（209）Bi ions are investigated in detail. The linear energy transfer covers the range from 50 to 99.8 Me V/（mg/cm^2）. When the memory chips are powered off during heavy ions irradiation, single-event-latch-up and single-event-function-interruption are excluded,and only 0-〉1 upset errors in the memory array are observed. These error bit rates seem very difficult to achieve and cannot be simply recovered based on the power cycle. The number of error bits shows a strong dependence on the linear energy transfer（LET）. Under room-temperature annealing conditions, the upset errors can be reduced by about two orders of magnitude using rewrite/reprogram operations, but they subsequently increase once again in a few minutes after the power cycle. High-temperature annealing can diminish almost all error bits, which are affected by the lower LET ^（129）Xe ions. The percolation path between the floating-gate（FG） and the substrate contributes to the radiation-induced leakage current, and has been identified as the root cause of the upset errors of the Flash memory array in this work.

关键词： heavy ion Flash memory single event upset annealing

Gut microbiota: a potential target for insulin resistance and type 2 diabetes mellitus

在线全文

学校读者我要写书评

暂无评论

Microenvironment & Microecology Research 2021年第3期3卷 1-8页

作者： Jiang-lan long Dan Yan Beijing Friendship Hospital Capital Medical UniversityBeijing100050China Beijing Institute of Clinical Pharmacy Beijing100050China. Beijing Friendship Hospital Capital Medical UniversityNo.95Yong’an RoadXicheng DistrictBeijing100050China

Insulin resistance(IR)runs through the whole process of occurrence and development of type 2 diabetes *** microbiota is the largest micro-ecosystem in human body,which has an important influence on the metabolism of material and *** studies have shown that besides genetic and islet dysfunction,disorders of the gut microbiota induced by dietary imbalance may lead to IR,which influence ***,we reviewed the research status of the correlation between IR and gut microbiota,and summarized the relationship between IR and gut microbiota,metabolites of gut microbiota and IR,and possible mechanism of gut microbiota participating in IR,which provides theoretical basis and literature reference for the treatment of IR and type 2 diabetes mellitus by gut microbiota regulation.

关键词： microbiota Metabolites Insulin resistance Type 2 diabetes mellitus

Myocardial infarction following recombinant tissue plasminogen activator treatment for acute ischemic stroke： a dangerous complication

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Medical Journal 2012年第15期125卷 2775-2776页

作者： ZHOU Zhi-gang WANG Rui-lan YU Kang-long Department of Emergency and Intensive Care Medicine ShanghaiFirst People's Hospital Shanghai Jiao Tong University Shanghai201620 China

Thrombolysis with intravenous tissue plasminogen activator （t-PA） is currently an approved therapy for patients with acute ischemic stroke. Acute myocardial infarction （AMI） immediately following t-PA treatment for stroke is a rare but serious complication. A case of acute myocardial infarction （MI） following IV t-PA infusion for acute stroke was observed. This is a 52-year-old male with a known history of hypertension and chest pain, who subsequently developed MI four hours after IV t-PA was administered for acute ischemic stroke. The disruption of intra-cardiac thrombus and subsequent embolization to the coronary arteries may be an important mechanism. In addition, spontaneous recanalization of infarct-related arteries may be associated with greater myocardial salvage and better prognosis.

关键词： stroke myocardial infarction tissue plasminogen activator